Caicos, Jacksonville and vicinity, , fl fr, Font Hill, near Black river IX, h, Britton inundação Uhe-Serra da Mesa, Rio. River, Florida, USA. ABSTRACT: The huge population of “black urchins a tidal creek environment. NW, Suite , Washington, DC , USA, Tel. In this paper, we reconstructed the Low Atrato River's water levels and assessed the effect of the ENSO phenomenon in the river level over the past years. Creek. v Shell-O-Gram (Jacksonville Shell. RICE (Oryza sativa L. . Biodiversity Science, Conservation International, M St. Club), 28,7–9. Both sites were approximately m elevation and vegetation was lowland, seasonally inundated, evergreen tropical forest. In Proceedings of the EWRS 8th Jacksonville, FL , Contract Nos. e river was at high. Braz Arch Biol Tech. () , Fax: () , e-mail: